Process for manufacturing artificial silk



1 and as no-waste is Patented Oct. 12, 1926.-

UNIT-ED sTAT'Es- T;EN Lonucal,

MASABU EIIRASAWA-OF TOKYO-EU, JAPAN, Ass mno YOKOE'AMA, JAPAN,

- raocnss Boa manurncruamq ARTIFICIAL,

n Drawing. Application filed April 27; 1925,

This invention relates to a process for manufacturing artificial'silkfrom fibre obtained from any caterpillar of the Bom-v bycidae' family bydissolving the fibre in a solution of zinc chloride mixed with zincoxide, forcing the Solution through capillary nozzles into I into asolution of an acid salt, and hardening them by treating themwithformaldehyde or its compound; and the object thereof is to spinartificially from solutionof silk fibres silk filaments without anylossand .thus to increase yield.

In this invention a solution of fibroin fibre ejected by caterpillars ofany worm belonging to the family Bombycidae in zinc chloride is forcedthrough capillary nozzles into filaments just as when manufacturingartificial silk, the filaments thus forced out are passed intov asolution of an acid salt, then into a solution ofa formaldehyde such asformalin or hexamethylene tetramine, an

the filaments are dried, thus obtaining perfectly hardened filaments.

According to this invention, anything conv filaments, passing thefilaments- Serial No. 26,299,- and- Dissolve raw material in 20-40% ofZinc chlorid amount of-zine ox keep' it still fluid from- ,concret'thickfluid thusobtained of glass, or the 'like,,an

thus obtained into hering thereto,

SILK.

ide,

for some time,

e residues.

n of 1% h as formalin, or hexa- '--ethyl alcohol, or xtra'ct metal"salts ad- 3 T0 sHoz'ABuRo nosn'i'no, or

in Japan .Mey- 7, 1924."

a solution of e mixed with a smallfilter, the liquid, or- 40 andseparate Force the from fine spouts d pass the filaments solution of i0%am 4'5 monium-acid-sulphite. Then pass the filaments into a solutiohydecompoun'd suc methylene tetramine, methyl alcohol, ande at the sameof a formaldetimesolidifying the fibroin. The half' dried filaments areperfectly dried then stretched, and

Claims.

1.,A processof in 'ficially consisting-in stances, ,the' chief fibroid,in

a solution of anufacturing, silk arti-' dissolving fibrous subingredient.of which is zinc chloride, forcing the fluid thus obtained out ofcapillary noz- 21%, and using as the first solidifying bath a solutionof all'rali-acid-sulphiteand as'the second solidifying dehyde in such asalcoh 'bath a solution of formal- 2i Alprocess of manufacturing silkartificially consisting in dissolving a silky sub- .stance 111 asolution of zinc chloride mixed with a small quantity of zinc oxide,forcing out of capillary nozzles the fluid thus obtheproductfsuccessively through a bath ofalkali-acid-sulphite and N that offormaldehyde. In testimony whereofI name to this specification.

' MASARU tained, and passing have signed 'my HIRASAWA,

